<template>
  <div>
    <!-- ShopGoods组件 -->
    <div class="goods">
      <div class="menu-wrapper">
        <ul class="ulBox" ref="ulBox">
          <li class="menu-item" :class="{current:index===currentIndex}" 
          @click="clickMenuItem(index)" 
          v-for="(good,index) in goods" :key="index">
            <span class="text bottom-border-1px">
              <img class="icon" :src="good.icon" v-if="good.icon" />
              {{good.name}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper">
        <ul class="foodsUl" ref="foodsUl">
          <li class="food-list-hook" v-for="(good,index) in goods" :key="index">
            <h1 class="title">{{good.name}}</h1>
            <ul>
              <li class="food-item bottom-border-1px" 
              v-for="(food,index) in good.foods" :key="index"  @click="showFood(food)">
                <div class="icon">
                  <img width="57" height="57" :src="food.icon" />
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                    <span>好评率 {{food.rating}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <span class="old" v-if="food.oldPrice">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <CartControl :food='food' />
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <!-- 购物车商品结算功能 -->
      <ShopCart />
    </div>
    <Food :food="showMyfood" ref="food"></Food>
  </div>
</template>

<script>
import CartControl from "../../../components/CartControl/CartControl.vue";
import { mapState } from "vuex";

import BScroll from 'better-scroll'
import Food from '../../../components/Food/Food.vue'
import ShopCart from '../../../components/ShopCart/ShopCart.vue'
export default {
  props: {},
  data() {
    return {
      // currentIndex: "",// 当前左边菜单高亮的索引
      tops:[],//获取所有food里面的li的滚出去的高度值
      scrollY:'',//获取时候滚动的高度
      showMyfood:{}//定义food组件的应用
    };
  },
  computed: {
    ...mapState(["goods"]),
    currentIndex() {//计算左边对应的分类高亮 //当前左边菜单高亮的索引
      let {tops,scrollY}=this
      let index = tops.findIndex((item,index)=>{
        return scrollY>=tops[index]&&scrollY<tops[index+1]
      })
      console.log(index);
     return index 
    }
  },
  created() {},
  mounted() {
    this.$store.dispatch('getShopGoods',()=>{
      // 下一次dom更新后执行
      this.$nextTick(()=>{
        // 调用我们的getScroll
        this._getScroll()
        this._initFood()
      })
    })
    // this.getShopGoods();
  },
  watch: {},
  methods: {
    // ...mapActions(["getShopGoods"])
    _getScroll() {
      // 左边滚动
      this.menuScroll = new BScroll('.menu-wrapper',{
          probeType:2,
          click:true  //可以触发点击事件
      })
      // 右边滚动
      this.foodScroll = new BScroll('.foods-wrapper',{
        probeType:2,
        click:true
      })
      // 实时监听滚动事件
      this.foodScroll.on('scroll',({x,y})=>{
        // console.log(y);
        let scrolly = Math.abs(y)
        this.scrollY = scrolly// 获取滚动实时的高度
      })
      // 滚动停止的时候当前的y 也就是滚动的距离
      this.foodScroll.on('scrollEnd',({x,y})=>{
        this.scrollY = Math.abs(y)
      })
    },
    _initFood() {
      // 1 给右边的food绑定滚动监听事件 目的 实时的可以监听到滚动的高度
      // 2 获取到滚动的高度 通过计算 然后来判断 当前的高度在food整个盒子的具体位置
      // 获取不到foodScroll
      let top = 0
      let tops=[]
      tops.push(top)
      let ul=  this.$refs.foodsUl
      let lis = ul.children
      Array.from(lis,(li,index)=>{
        let liHeight=li.clientHeight
        top+=liHeight
        tops.push(top)
      })
      this.tops = tops
    },
    clickMenuItem(index){
      // console.log(index);
      // 右边food应该滚动的高度值
      let top = this.tops[index]
      console.log(top);
      // 怎么样触发右边的滚动事件 并且让右边food滚动到当前位置
      // scrollTo(x,y,time,easing)
      this.scrollY = top
      this.foodScroll.scrollTo(0,-top,300)
    },
    showFood(food){
      this.showMyfood = food
      // console.log(this.$refs.food);
      
      this.$refs.food.toggleShow()
    }
  },
  components: {
    CartControl,
    Food,
    ShopCart
  }
};
</script>

<style scoped  lang='stylus' >
  @import "../../../common/stylus/mixins.styl"
  ul 
    padding 0
    margin 0
    clear both
  .goods
    display: flex
    position: absolute
    top: 195px
    bottom: 46px
    width: 100%
    background: #fff;
    overflow: hidden
    margin-top 40px
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        padding: 0 12px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          color: $green
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          bottom-border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        bottom-border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            line-height: 12px
            margin-bottom: 8px
          .extra
            .count
              margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
